Mining machine



July 11, 1939. E. MITCHELL MINING MACHINE Filed May 26, 1933 9 Sheets -Sheet 1 [/VVENTOR Lew/ls E M/fc/vefl L. E. MITCHELL MINING MACHINE Filed May 26, 1953 9 Sheets-Sheet 3 E. MITCHELL 2,165,404

MINING MACHINE July 11, 1939.

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MINING MACHINE Filed May 26, 1955 1 9 Sheet-Sheed 8.

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f/YVENTOR 4 Lew/Is {if/7th el/ AfT'Y July 11, 193 I L. E. MITCHELL MINING MACHINE 9 Sheets-Sheet 9 Filed May 26, 1933 [N l/EN TOP? Lew/ls E M/fch e ATT'X Patented July 11, 1939 UNITED STATES PATENT OFFICE MINING MACHINE Lewis E. Mitchell, Columbus, Ohio, assignor to The Jefirey Manufacturing Company, a corporation of Ohio The present invention relates to mining machines particularly of the type adapted to travel on a mine track and remain thereon to be braced thereby during operation.

One of the objects of the present invention is the provision of an improved and efiicient mining machine which shall have a minimum overall height and be very compact to operate in a relatively low roof mine chamber.

Another object of the invention is the provision of improved and eflicient mechanism for supporting and adjusting a kerf-cutter on a horizontal axis from a horizontal plane at the level of the mine floor to a horizontal plane above the mining machine but adjacent the same for operation in a relatively low roof mine chamber.

A further object of the invention is the provision of improved mechanism for detachably mounting a self-contained power-operated drilling machine in'cooperative relation with an elongated cutter bar which is adjustably mounted on a truck adapted to travel on a mine track so that whenever desired the mining machine may be used to support the drilling mechanism in a any one of many different positions at the coal ;position of the cutter bar.

Another object of the invention is the provision of a demountable drill associated with a mining machine cutter bar so that the various adjustments of the cutter bar may be accompanied by the supporting of the drilling mechanism in position to command the entire area of the working face.

Another object of the invention is the provision of mountings for the drill which will coact to produce the effect of a universal mounting, each of the said mountings comprising elongated supports adjustable to virtually any desired posi tion for eifecting adjustment of the drill for operation universally with respect to the coal face and with respect to the ribs at the sides of the mine entry in which the machine is adapted to operate.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the drawings:

Fig. 1 is a plan view of the machine of the present invention, illustrating the mounting of the drill mechanism;

Fig. 2 is a side elevation Oi 1 1i? ma lline of Fig. 1;

which the drill is adapted to be mounted;

Fig. 7 is a side elevation of the lower arm illustrated in Fig. 6; 15

Fig. 8 is a sectional view taken on the line 8-8 of Fig. 7, looking in the direction of the arrows;

Fig. 9 is a sectional view on the line 9-9 of Fig. 6, looking in the direction of the arrows; 20

Fig. 10 is a plan view of the complete mining machine shown in Fig. 1, showing the mechanism for swinging the cutter bar and adjusting the position of the drill on the vertical axis of the turntable; Fig. 11 is a bottom plan view of the structure shown in Fig. 10 to show the power-operated mechanism for varying the elevation of the cutter bar relative to the truck on which the turntable is mounted;

Fig. 12 is a detailed view of the individual screw post elevating mechanism for the turntable, including an individual controlling clutch to secure variation of inclination of the cutter bar on either a longitudinal axis of the turntable or a. horizontal transverse axis thereof;

Fig. 13 is a longitudinal enlarged sectional view of that portion of the mining machine shown in Fig. 1 which embodies the turret for swinging the cutter bar on a lowered horizontal 4Q longitudinal axis combined with an additional turret for swinging the cutter bar in its own plane;

Fig. 14 is an enlarged plan view of the righthand portion of the structure shown in Fig. 13

Fig. 15is a sectional elevation of the controlling mechanism shown in plan at the upper lefthand portion of Fig. 14;

Fig. 16 is a sectional plan view taken on the line l6-l6 of Fig. 15;

Figs. 17 and 18 are more or less diagrammatic views to illustrate the power transmission and control mechanism for swinging the turrets on their respective axes;

Fig. 19 is an enlarged plan view of Fig. 18 on the plane of line |9-|9 of Fig. 18, looking in the direction of the arrows;

Fig. is an enlarged fragmentary sectional elevation taken on the line 29-20 of Fig. 17, looking in the direction of the arrows;

Fig. 21 is an enlarged sectional elevation to show the clutch controlling mechanism for the power transmission from the motor on the turntable to the turret rotatable on the horizontal axis shown in Fig. 13, the View being on the line 2|--2| of Fig. 24;

Fig. 22 is an elevational view of the manual mechanism for operating the disc clutch shown in Fig. 21;

Fig. 23' is a sectional elevation taken on the line 2323 of Fig. 22;

Fig. 24 is a sectional elevation taken on the line 24--24 of Fig. 22 looking in the direction of the arrows;

Fig. 25 is a diagrammatic plan View showing the machine in operative position having completed a top out, various positions of the drills being shown in dotted lines;

Fig. 26 is a side elevation of the machine in Fig. 25, the view illustrating a drill hole in dotted lines and indicating how drilling may be effected with a top cut, the position of the cutter bar for a shear out being shown in dotted lines;

Fig. 27 is a top plan view similar to Fig. 25, but showing the positions of the drills and cutter bar, the latter having completed a bottom out, positions of the cutter bar for shearing cuts being shown in dotted lines;

Fig. 28 is a side elevation of the machine as shown in Fig. 27;

Fig. 29 is a plan view of the machine showing the machine sumped in ready to start a lateral bottom out and illustrating the positions of the drill for accompanying drilling operations;

Fig. 30 is a similar View, but showing the machine ready to start a lateral top out; and

Fig. 31 is a fragmentary detail view of the mounting of the lower drill-carrying boom or arm.

Referring more particularly to the drawings, it will be seen that the kerf. cutting mining machine which may be converted into a combined kerf-cutter and drill by detachably mounting a self-contained power-operated drill adjacent the cutter bar 21 in a manner hereinafter described, comprises a truck frame 28 mounted on wheels 29, 29, which are adapted to travel on the mine track 30 and be laterally braced thereby during feeding movements of the cutter bar The kerfcutting machine may be of the type shown in the Levin Patent, No. 1,354,054, granted September 14, 1920, for an improvement in Mining machine, which includes a turntable, a cutter bar connected thereto to rotate therewith on an upright axis, mechanism for swinging the turntable and the cutter bar on such upright axis relatively to the truck and power-operated mechanism for varying the elevation and inclination of the turntable and the cutter bar relative to the truck.

The kerf-cutting mining machine also includes apparatus operated by an electric motor 3|, see Fig. 10, on the truck frame 28 for propelling the mining machine along the mine track 36 at a transport speed or at a slow feeding speed. A motor 32 is mounted on the turntable 33 to rotate bodily therewith and is connected to rope gearing comprising the rope 34 for swinging the turntable together with the cutter bar relatively to the truck on the upright axis of the turntable.

The truck propelling mechanism is shownin bottom plan View in Fig. 11 and comprises the sprocket chain 3|a to which the motor 3| is connected through the speed reduction gearing 3 lb. The motor 3| on the truck frame 28 is also connected to the cable reel 35 which pays out or winds up the electric cable 36 for conducting electric power from a distant source of supply to the motor 3| on the truck, the motor 32 on the turntable and the motor 31 of the drilling machine.

The mechanism for elevating the turntable together with the cutter bar and the drilling machine mounted on the turntable, as will be hereinafter described, comprises the sprocket chain 38 for rotating the vertical screw posts 39, 39, 39. Power may be transmitted to these screw posts individually as shown in Fig. 12 so as to effect variation of inclination of the turntable, the cutter bar and the drilling machine on either a longitudinal axis of the turntable or a horizontal transverse axis thereof.

The armature shaft 40 of the motor 32 on the turntable extends horizontally forward and radially of the turntable. At the forward end of the armature shaft 40 is a bevel pinion 4| (Fig. 13) which meshes with a horizontal bevel gear 42 secured to the vertical shaft 43 which is journalled in the bearing 44 of the turntable 33. Secured to the upper end of the vetical shaft 43 is a bevel gear 46 which meshes with a bevel gear 4'! mounted on the left-hand end of the horizontal shaft 46 journalled in the frame 45, rigidly secured to the turntable 33. The bevel gears 46, 41 may be lubricated by oil from the closed chamber 48a through the nozzle 49. The journal bearings for the horizontal shaft 48 may be lubricated by oil from the closed chambers 56, 5| through the oil holes 52, 53. A cover plate 54 closes the chambers 48, 50 and 5| and the lubricant in these chambers may be replenished by removing the screw plugs 52a, 53a and 54a.

At the right-hand end of the horizontal shaft as viewed in Fig. 13 is secured a gear 55 which meshes with a gear 56 on the left-hand end of the shaft 51 which is ofi-set from the horizontal shaft 46 but is in the same vertical plane therewith Whether or not the cutter bar is in a horizontal plane. The axis of the shaft 51 is also off-set from the horizontal of the motor shaft 46.

As will be hereinafter explained, the shaft 57 is journalled interiorly of the turret frame 58 which is rotatable relatively to the auxiliary frame on the horizontal axis of the shaft 57. At the right-hand end of the shaft 51 is a bevel gear 59 which meshes with the horizontal bevel gear 60 as viewed in Fig. 13. The gear 66 is journalled loosely on the shaft 6| and the latter is journalled in the bearing 62 of the cap 63 secured to the turret 58. The shaft 6| is also journalled at its lower portion in the bearing 64 which is secured rigidly to the second turret frame 65, or integral therewith. The second turret 65 is mounted for rotation on the axis of. the shaft 6| relatively to the first turret 58.

Rigidly connected to the lower end of the turret 65 is the cutter bar 21 in position to occupy a plane at right angles to the axis of the shaft 6|. Guided along the periphery of the elongated cutter bar 2'! is an endless cutter chain 66 which meshes with the driving sprocket 61 secured to the lower end of, the shaft 6|. By means of the clutch 68 the bevel gear 60 may be connected to the shaft 6| to drive the sprocket 61 and chain cutter 66, The clutch 68 may be manually operated from either side of the machine by means of one of the levers 69, 69. By moving one of the levers 69 the rockshaft 10 will actuate the shipper 11 to throw the clutch in or out as shown in Fig. 13.

In order to rotate the turret 58 on the horizontal axis of the shaft 51, power transmission mechanism is arranged between the gear 55 and the worm gear 12 which is rigidly connected to the turret frame 58. By referring to Fig. 23, which is a sectional view taken on the line 23-23 of Fig. 13 looking in the direction of the arrows, or on the line 23-23 of Fig. 22 looking in the direction of the arrows, it will be seen that the gear 56 meshes with an idler 12a, and that the latter meshes with a gear 13 which in turn may be connected to the shaft 14 by means of the friction clutch 15 as shown in Fig. 21.

The friction clutch 15 may be thrown in or out by means of the lever 16 as shown in Fig. 22. The lever 16 is pivoted at 11 and is provided with an adjustable screw 18 held in fixed position by the nut 19 so as to engage the upper end of the actuating arm which is urged against the screw 18 by the spring 81. The lower end of the actuating arm 80 is keyed to the rockshaft 82 which extends into the housing 83 rigidly connected to the depending supporting bracket 45a on the auxiliary frame 45. Within the housing 83 (Fig. 24) is a shipper 84 connected to the clutch operating element 85 which is shown in Fig. 21 in position to move the outer set of discs of the friction clutch toward the annular flange 86 of the clutch element 81. The inner set of friction discs is connected to rotate with the clutch element 81 which is keyed to the shaft 14. The outer set of friction discs is connected to the clutch element 88 which is secured to or integral with the gear 13 to rotate therewith. Therefore when the motor 32 on the turntable 33 is operated in one direction or the other, power will be transmitted through the train of gearing shown in Figs. 13 and 23 to the clutch element 88 and when the lever 16 is actuated to apply the friction clutch 15, the shaft 14 will be rotated accordingly.

Mounted on the shaft 14 is a worm 89 which meshes with a worm wheel 90, the latter being keyed to the shaft 91. As shown in Figs. 13 and 17, the shaft 91 carries a worm 92 which meshes with the large worm gear secured to the turret frame 58. Therefore when the friction clutch 15 is applied to transmit power to the shaft 91 from the motor 32 on the turntable, the turret frame 58 will be rotated on the axis of the shaft 51 while held in place by the annular retaining bearing 93. In other words, the rotation of the turret frame 58 will be on the off-set support 45a on the axis of the shaft 51 which is off-set from the axis 48. Consequently, since the shaft 51 is in a vertical plane that extends through the shaft 48 and occupies a position below the axial line of the latter, the chain kerf-cutter may more readily occupy a horizontal position at the floor level. Furthermore, by reason of the off-set position of the shaft 51, the turret 58 may be rotated on a relatively low axis so that the cutter bar when inverted to its full line position will occupy a position a short distance above the upper side of the cover plate.

After the chain kerf-cutter has been adjusted on the axis of the shaft 51 either to any one of its horizontal positions or to any one of its vertical positions, as will be described in more detail hereinafter, or to any intermediate inclined position, the friction clutch 15 may be released by releasing the lever 16, whereupon the spring 8| will separate the sets of friction discs sufficiently to permit the self-locking worm gearing 89, and 92, 12 to very effectively hold the kerf-cutter in the adjusted position.

In order to swing the kerf-cutter on the axis of the shaft 6| in either direction at a feeding speed, power transmission mechanism is connected between the bevel gear 60 and the large worm wheel 94 which is secured to the cutter bar turret 65 as shown in Fig. 13. Secured to the upper side of the bevel gear 60 as viewed in Fig. 13 is an eccentric cam 95, encircling which, is the circular strap 96 provided with a radial arm 91 to the outer end of which is pivoted at 98 the ratchet and pawl mechanism 99, as shown in Fig. 19. A retaining plate 100 is secured by means of the cap screws 101 to the eccentric cam 95 and is of sufficient diameter to overlap a portion of the circular strap 96 as shown in Fig. 13.

The pawl and ratchet mechanism is shown in detail in Figs. 15 and 19 and diagrammatically illustrated in Fig. 1'7. This pawl andratchet mechanism is mounted in a housing 102 which is provided at its upper side with a closure I03. Reversely arranged ratchet wheels I04 and 105 are confined between a shoulder at the upper end of the shaft 100 and the circular plate 101 which is secured by means of the cap screw 108 to the upper reduced portion 109 of the shaft 106. Mounted on the inverted cup-shaped support 110 are the reversely arranged pawls 1H and H2 which are pivoted to the support 110 on the pin 113. A spring 114 between the arms H5 and 116 extending from the pawls I11 and H2 urge the latter towards their respective ratchet Wheels 104 and 105.

Between the cup-shaped support 110 and the ratchet wheels I04, I05 is located a cylindrical pawl releasing device 111 which is provided with openings H8 and 118a as shown in Figs. 17 and 19. The upper central portion of the cupshaped pawl releasing device 111 as shown in Fig. 15 is connected to the shaft H9 which is journalled in the sleeves 120 at the upper central portion of the cup-shaped support 110. To the upper end of the shaft H9 is secured an arm or lever 121 the outer end of which is provided with a support 122 for the spring pressed pin 123 the upper end of which is provided with a knob I24 and the lower end of which may extend into one of the depressions 125 in the plate 126 secured to the upper side of the cap or cover 103. When the lever 121 is moved in one direction one of the pawls III or H2 will be thrown out of engagement with its ratchet wheel and the other pawl will be permitted to engage its ratchet wheel; and the position of the lever 121 will determine the position of the pawl releasing device 111 to regulate the extent of movement of the ratchet wheel upon each rotation of the eccentric cam 95. That is to say, the extent of feed in either direction of is journalled in a bearing I29 of a block I30 secured at I3I to the housing I02. Inasmuch as the pawls are reciprocated upon rotation of the cam 95, the frame IIO has its sleeve IIlla on its upper side mounted in the bearing I32 while the lower portion of the support H is secured to the annular member I33 journalled in bearings on the block I30.

The lower end of shaft I06 is provided with a bevel gear I34 which meshes with a bevel gear wheel I35 on the shaft J36. As is shown in Fig. 20, the shaft I36 is journalled in the bearings I31 and I38 and carries a worm I39. The relation of the parts between the eccentric cam 95 and the worm I39 is diagrammatically illustrated in Fig. 18.

As shown in Fig. 20, the bevel gear I35 is connected to the circular plate I40 by means of a shear pin MI and the plate I40 is keyed to the shaft I36. By means of the cap screw I42 the plate I46 is retained in place on the shaft I36 and the same cap screw may be used to retain in place the keeper I43 for the shear pin I4I. Since the worm I39 meshes with the large worm gear 94, swinging feeding movement of the kerfcutting mechanism is effected by operation of the worm gearing I39 and 94. If the cutter bar should engage unusually hard material such as a sulphur ball or if the feed should be inconsistent with the hardness of the material, the pin I4I will be sheared in two to protect the power transmission mechanism. Such shearing of the pin I4I will not interfere with the self-locking feature of the worm gearing I39, 94 to hold the cutter bar 21 in interlocked relation .to the first turret frame 58.

The track mounted mining machine may be operated in various ways to produce kerfs either in horizontal planes or in vertical planes, or in intermediate inclined planes all at right angles to the working face. Traction feed may be effected by controlling the truck propelling mechanism to move along the mine track at feeding speed. The cutter bar may be adjusted in elevation and in inclination by the mechanism associated with the three screw posts 39 between the truck frame and the support for the turntable. The cutter bar may be swung arouately either on the turntable axis or on the axis of the shaft 6| When the plane of the cutter bar is parallel to the mine track sumping and withdrawal cuts may be made either in upright planes or in horizontal planes or in intermediate inclined planes. The flexibility of the mining machine enables the latter to produce kerfs over a wide range and consequently it is desirable to provide a wide range of flexibility of positioning of the drilling mechanism so that drill holes may be produced to most effectively enable the blasting charges to co-operate with the kerfs to dislodge the coal with a maximum amount of lumps and a minimum amount of slack.

In order to retain the cutter bar locked in a stationary position at an adjusted angle, the mechanism shown in Fig. 24 is preferred. During mining operations, vibrations of the cutter bar may tend to cause creeping between the worm gear elements, and to prevent this, there is mounted a spring-pressed brake as shown at I10 in Fig. 24 to act against an annular flange I?! on a nut I12 which is screw threaded to the extension I13 and pinned thereto at the lefthand end of the worm shaft 9!. The shaft 9| is mounted in the bearings I14 and I15 in the casing I16 which is integral with or secured rigidly to the neck I11 as shown in Fig. 13. The casing I16 and neck I 11 are rigidly connected to the depending bracket 45a. and the latter in turn is integral with or rigidly connected to the auxiliary frame 45 fixed to the turntable 33. The mechanism for swinging the turntable on a vertical axis relatively to the truck is also provided with self-locking worm gearing to hold the turntable locked to the truck when it is desired to hold the cutter bar stationary relative to the truck.

It is frequently desirable, for reasons of convenience, to carry out drilling operations with the same machine that is employed for cutting. As has been previously indicated, therefore, a drill is mountable adjacent the cutter bar in planes above or below the cutter bar. Figs. 1 and 2, for example, illustrate the drill mounted in position on its supporting mechanism, the cutter bar being shown in a lower cutting position. The drilling operations may be carried out simultaneously with the cutting operations, or be timed as desired relative to such operations. The drilling machine employed is a selfcontained power-operated drilling machine which is suitably mounted on the extremity of an arm or boom adapted to swing horizontally about a vertical axis, the drilling machine being directly mounted on a bracket or arm pivotally interconnected to the free end of the boom, so that the drilling machine is capable of a very flexible adjustment in any desired direction. The drilling machine may be of the type shown in the Trotter patents, Nos. 1,087,089 and 1,086,797.

The drilling machine indicated at I44 is mounted on a slide I45, which is slidably mounted between parallel guides I46 mounted on the turntable 33. As will be apparent from the drawings, the mounting is effected through an arm I41, which is pivoted to the slide I45 at I48. Pivoted tothe free end of the arm at I49 is a bracket, or segmental rack I 6|, on which the drill I44 is directly mounted for pivotal movement in horizontal and vertical directions as will be described later in greater detail.

In order to effect adjustment of the slide I45, one side thereof is formed as a rack II, with the teeth of which meshes the pinion I52 turnable on a vertical axle I53. The pinion is mounted in one of the guides I46 and the axle I53 extending above the guide I46 is engageable with a proper tool I530. by which the pinion I52 may be actuated to effect a corresponding movement of the slide I45. It will be noted that the guides I46 are mounted on the turntable 33 and with the turntable form a part of a boom structurn mounted on the portable base 28.

The arm I41 comprises upper and lower members I41a and I 41b, respectively, these members being joined by vertical webs I 410. The pivotal mounting I48 of the arm comprises the pin I54 which is secured in the bottom of the slide I45, the pin I54 being threaded, as indicated at I55, along its length, to receive the nut I56 which is turnably mounted on the arm I41 between the upper and lower members thereof. The nut I 56 is provided with operating extensions I 51 for facilitating the turning of the nut. As this nut is turned, the arm I41 is loosened or tightened relative to the slide I45, and, if desired, may be lifted, in this manner, completely from the pin I54. A serrated locking member I 58 is secured to the under side of the lower member I 41b of the arm, the locking member I 58 being adapted to engage with 73 a similarly serrated complemental member I59, the teeth of the serrated locking members being held in interlocked relation by the action of the nut I56 clamping together the parts I58 and I59 and preventing turning of the arm I41 while the said locking parts are clamped together. The part I59 is duplicated at each end of the slide I45 so that the arm I41 may be applied to either end of the slide. Free swinging of the arm is obtained by loosening the nut I56, and tightening of the nut enables the arm to be locked in any desired position.

Through the other end of the arm I41 passes the pin I49 which serves as the pivotal or swivel mounting for the bracket or rack l6l upon which the drill I44 is mounted through means of the bracket I60, integral with bracket or rack I6I, and which is adapted to receive mounting means I6Ia 0n the drill I44, which mounting means forms a bracket for enabling the drill to be held in place. A releasable locking plate I50 normally holds the drill in horizontal position relative to the arm I41. The rack I6I is welded as at I62, I62 to a boss I63 through which passes the pin I49, and which has shoulders I64 and I65 which rest upon the plate I50 and rack I6I respectively. The boss I63 is provided with a slot I66 in which is positioned the locking pin I61, which pin engages an opening I68 in the plate I50 thereby locking the drill I44 in horizontal position, and preventing removal of the drill until the pin is lifted out of the opening I68, by means of the handle I69, and the plate I50 turned until one of the notches I18 registers with the pin, when the drill may be demounted, the securing plate I19, referred to in more detail hereinafter, being first removed. When the plate I50 is turned as just indicated, the drill I44 is released to swing vertically around its horizontal arm.

The lateral supporting bracket I6Ia for the drill is provided with an arcuate flange I80, fitting into a circular guide groove I8I forming an arcuate track in the bracket I60.

An arcuate locking plate I19 is secured by screws I83 to the bracket I60, and is encompassed by the groove I8I, being concentric with the groove and being of such diameter as to aiford a circular space for traveling of the flange I80, which is L-shaped in cross-section as shown in Fig. 5. It will thus be seen that the plate I19 locks the flange I-in the groove I8I so that the drilling machine is locked against withdrawal from the upright plate I84 of the bracket I60. However, the drilling machine is free to be tilted manually on a horizontal axis which extends at right angles through the center of the plate I84 when the plate I50 is out of locking position. The friction between the flange I80 and the groove I8I may be sufficient to hold the machine in adjusted position prior to the starting of the drill into the coal face.

The pin I49 is provided with a key I85 to prevent the pin from turning.

The segment I6I provides means for adjusting the drill horizontally in any desired position, the drill being locked in adjusted position by engagement of the teeth I86 of the segment with latch I81 which is pivoted on a pin I88 suitably secured in a pair of terminal connecting webs of the boom. Lifting of the latch I81 releases the segment I6I.

It may be noted that adjustment of the drilling machine relative to the cutter bar may be made on intersecting axes which extend at right angles to each other. The adjustment of the drilling machine may be made on the vertical axis of the pin I49 and on a horizontal axis extending through the center of plate I84 or concentrically of the pin I54. By virtue of the adjustments of the turntable 33, combined with the adjustments of the arm I41, there is obtained a universal mounting for the drilling machine, which itself is adjustable to various positions on intersecting axes which extend at right angles to each other. The drilling machine may therefore be effectively supported to command substantially the entire coal face for axial feeding either at right angles to the coal face or at any oblique angle relative thereto since the feed of the drill is axially thereof, while the supporting framework of the mining machine remains stationary on the mine track.

In order to increase the effectiveness of the drilling operations, a second drill supporting arm I89 is mounted on the lower portion of the frame of the mining machine. The arm I89 is mounted through suitable instrumentalities including upper and lower rollers I90, to guide track I9I suitably mounted on the frame of the mining machine. The rollers I90 are doubly flanged, the rail of track I9I engaging the rollers between the flanges. The rollers are mounted on axles I92 carried in a bracket I93. Upper and lower plates I94 and I95 extending from the bracket I93 form a yoke through which is passed a vertical pin I96 which serves as a pivot about which arm I89 turns in a horizontal direction.

It will be seen from the drawings that the track I9I comprises the rails I91, I91 along'which run the rollers I90, and the guide I98 against which abuts the side I99 of the housing 200 of the bracket I93. The guide I98 has formed therein a plurality of alined holes 20I into a selected one of which is received a pin 202 which is normally urged towards these openings by a spring 203 seated in a cup-like recess 204 formed in housing 200. As long as the pin 202 is in engagement with a hole 20I, the housing 200 is held against movement relative to the frame of the mining machine, and consequently the arm I09 is held against horizontal displacement relative to the frame of the mining machine. It may be noted that spacers 205, 205 properly support the lower track rails I91 at a suitable distance from the guide I98, while the top rail I91 is spaced from said guide by a spacing bar 205a.

For enabling adjustment of the arm I89 relative to the frame of the mining machine the following instrumentalities may be provided: The pin 202 is slotted for the reception of a roller 206. Engaging this roller 206 is a slide bar 201 having a cut-out portion 208 near the center of the bar. In the cut-out portion 208 is formed a cam-shaped notch 209, with which the roller 206 is in engagement. The slide bar 208 is actuated by pulling on chains 2I0, 2I0 fastened to each end of the slide bar 201, thus effecting displacement of the slide bar, the pin 202 being retracted against the pressure of the spring 203 by the action of the notch 209 upon the roller 206, thereby pulling the pin 202 out of engagement with the opening 20 I. The housing 200 is thus released for adjustment relative to the mining machine frame.

Top and bottom extensions 2 and 2I2 of the arm I89 turn upon pin I96 as an axis. The pin I96 has its upper end threaded, as indicated at 2 I 3 for the reception of a nut 2 I 4, which is provided with an operating handle and yoke 2I5. A toothed locking member 2I6 is secured tothe top extension 2 and mates with a complemental locking part 2I1 mounted on bracket plate I94, so that when the nut 2I4 is tightened, the engagement of the teeth of the locking parts 2I6 and 2I1 prevent turning of the arm I89 around the pin I96.

As in the case of the upper arm I41, the outer end of the lower arm I89 is provided with means for mounting a drill thereon. These means embrace a segmental rack 2I8 turnably mounted on pin 2I9 which, in turn, is mounted between the upper and lower extensions 220 and 22I, respectively of the arm I89. The rack 2I8 is similar to the segmental rack IBI on the upper arm, and operates in a similar manner, being releasably held in adjusted position by a latch 222, which is fixed in position to continuously engage the teeth 223 of the segmental rack. Integral with the rack 2I8 is the mounting 224 for the drill, similar tothe mounting I60, which is provided with the groove 225, similar to the track I8I previously set forth. The plate 226, corresponding to the plate I50, is shown in Fig. 6 to be turned in position for enabling removal of the drill from its mounting, or to permit vertical movement of the drill. The plate 226 is provided with grooves or notches 221 corresponding to the grooves or notches I18 of the plate or arm I50.

It will be observed that the pin 2I9 is screwthreaded along its length, the threads providing a vertical adjustment for the drill, since the mounting instrumentalities for the drill are internally threaded to travel on the pin 2 I9. In order to operate the pin 2I9, the end thereof extends beyond the extension 220 for receiving an operating handle 228, by means of which the pin 2I9 may be turned.

For releasing the segmental rack 2"! to enable the same to be horizontally adjusted, the latch 222 is provided with a central cut-out portion 229 which clears the teeth 223 of the rack when the rack travels alongthe pin 2I9 responsive to rotation thereof, so that the teeth 223 register with the notch 229. In such position the drill may be turned horizontally intoany adjusted position. When not in service, the arm I89 may be swung against the frame of the mining machine, as indicated in Fig. 2, where is is out of the way, or it may be turned to the position indicated in Fig. 31 for drilling at the extreme end of the cut, as indicated in Fig. 30, the upper arm I41 being folded within the limits of the guides I46...

By referring to the diagrammatic views of Figs. 25 to 30 inclusive, some of the various adjustments of the mining machine to secure the desired positioning of the drilling machine will be understood. Fig. 25 illustrates adjustment of the cutter bar on the vertical axis of the turntable 33 and on the axis til at the rear end of the cutter bar to enable the cutter bar to cut a kerf adjacent the roof of a mine room of different widths, the view indicating the depth of the cut and location of drill holes drilled by the drilling machine mounted on the lower arm I89, the upper arm I41 being folded or collapsed within the limits of the guides I46.

Fig. 26 is a side view of the machine in the position illustrated in Fig. 25, the view showing the kerf cut adjacent the roof of the mine room and the drill holes adjacent the floor of the room. The view indicates, in dotted lines, the position of the cutter bar for making a shear, or vertical, cut.

Fig. 27 shows the cutter bar inverted relative to the position thereof in Figs. 25 and 26, the kerf being cut on a plane adjacent the floor of the room, and the drilling on a plane adjacent the roof. For this purpose the drilling machine is mounted on the upper arm I41, the lower arm I89 being folded against the frame of the mining machine so as not to interfere with the operations. The view shows, in dotted lines, the adaptation of the machine for rooms of different widths and also the inverted positions of the cutter bar for making shear cuts.

Fig. 28 shows a side view of the machine as illustrated in Fig. 27. The view illustrates clearly the inverted position of the cutter bar relative toits position in Fig. 26.

Fig. 29 shows the machine sumped into position to make a bottom out, the cutter bar 21 operating about the pivot 6|, the cutter bar being shown in position for starting the lateral cut, and the drill being adapted to be operated simultaneously with the cutter bar. The drilling machine is mounted on the upper arm I41, the extreme positions of which are indicated in the figure. The lower arm I89 is folded against the frame of the mining machine, out of the way.

Fig. 30 shows the machine sumped into position to make a top out, the cutter bar 21 again operating about the pivot 6I. The cutter bar is inverted relative to its position of Fig. 29. The drilling machine is mounted on the lower arm I89, the extreme positions of which are indicated in the figure. The upper arm I41 is shown as being collapsed within the limits of the guides I46. The drilling machine is again operable simultaneously with the operation of the cutter bar.

Since the drilling machine is mounted independently of the cutter bar, the drilling may precede, follow, or be simultaneous with the cutting operations. The adjustments of the drill mountings and cutter bar enable a virtually unlimited flexibility of cutting and drilling operations to be obtained.

Drilling and cutting operations may be carried on in a room of any desired width and height. The lower arm permits drilling in planes near the floor of the room, the cutter bar being at any desired elevation or position, being dependent upon the adjustment of the turntable and the position of the cutter bar on its rear turret which, in itself, enables a considerable variation in the level of the cutter bar to be efiected not only because of the invertibility of the turret, but also through the variations in height of the cutter bar from the floor which may be accomplished through vertical adjustments of the turntable, resulting in elimination of substantially all blind spots.

By reason of the off-set axis of the shaft 51, the turret 58 may remain below the plane extending through the top of the machine. That is to say, when the turntable is in its lowermost position and the shaft BI is horizontal to extend from either side of the shaft 51 the overall height of the entire machine is no greater than the top of the turntable. Consequently, the machine may be used for drilling holes in any position extending entirely across the working face and at substantially any elevation between the floor and the roof, in a very low roof mine room. A plurality of shearing or vertical cuts may also be made in such low roof mine room. The height of the room may vary from that in which the machine may be cleared when the turntable is in its lowermost position to that in which the height may be at the limit of operation of the drill when at its maximum vertical adjustment, with the cutter in an upright plane and extending substantially vertically upward.

The width of the mine entry or room may vary from a narrow place to one twice the radial distance from the turntable axis to the outer end of the cutter bar.

In order to lock the turntable-33 to the ring 230 which is mounted on the adjusting screw posts 39, locking devices 23| are associated with the notches 232 in the periphery of the turntable 33 (see Fig. 10). The ring 230 is carried by the pedestals 233 which depend therefrom, and a nut 234 is threaded on the screw post 39 as shown in Fig. 12. By means of the lever 235 the clutch 236 may be operated to control individual elevation of the nut 234 and the pedestal 233, the sprocket 231 being connected to the vertical screw post 39 to rotate therewith.

In the drilling machine shown in Figs. 1 and 2, the electric motor may be controlled by an electric switch operated by means ofa lever 238. The rotation of the drill bit 239 together with the drill socket and holder 240 may be controlled by the mechanism operated by the rotatableknob 24 l. The feed screw 242 extends entirely through the supporting structure and is guided at the rear of the drill frame by means of the tube 243. The rotation of the drill bit and the feed thereof into the coal face as well as the withdrawal therefrom is effected by rotation of the feed screw 242, the operating mechanism of which is driven by the electric motor 31 under the control of the actuating knob MI. The feed of the drill bit is of course axial, and so also is the withdrawal thereof from the drill hole. A locking pin 244 holds the drill bit 239 in its socket 240.

The frame 245 of the drilling machine is provided with the lateral supporting brackets IGIa, each of which is provided with the arcuate flange I80 fitting into the guide groove l8l, as has been previously described. One of these brackets I6Ia is mounted on each side of the drilling machine, which further increases the flexibility of the mounting thereof.

A junction box I82 is provided for forming a connection means between the drill motor 31 and supply cable l82a which in turn connects with cable 36.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and I wish therefore not to be restricted to the precise construction herein disclosed.

Havingthus described and shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

1. In a mining machine, the combination with supporting framework, of a kerf-cutter mounted thereon for adjustment relative thereto in relativelyhigh and relatively low p1anes,a drilling unit, mechanism adapted to mount said drilling unit on either the upper or lower front end of said framework to occupy positions in relatively high positions in advance of said framework when said kerf-cutter is in relatively low position and in relatively low positions when said kerf-cutter is in relatively high position, and means for operating said kerf-cutter while said drilling unit operates.

2. In mining apparatus, the combination with supporting framework, of a drilling machine, semi-circular arcuately flanged brackets on opposite sides of said drilling machine, and grooved mechanism adapted to be connected to either of said brackets to support the drilling machine adjacent either rib of a mine entry for operation in vertical planes parallel thereto.

3. In mining apparatus, the combination with a drilling unit, of brackets on opposite sides of said drilling unit, a rotatable support for receiving either of said brackets, and means for mounting said rotatable support on said framework to extend from either lower corner thereof to enable said drilling unit to operate adjacent to either rib of a mine entry and parallel thereto.

4. In mining apparatus, the combination with supporting framework, of track mechanism extending across the front end thereof, a support movable along said track mechanism, an arm pivoted to said support and movable bodily therewith relatively to said framework, a turntable mounted at the outer end of said arm for rotation relatively thereto on a vertical axis, means for locking said turntable in adjusted position, a grooved arcuate socket on said turntable, a drilling unit, and arcuate brackets on opposite sides of said drilling unit and each adapted to fit said grooved arcuate socket, said drilling unit being adjustable by means of said bracket and socket connection on a transverse axis at right angles to the vertical axis of the turntable and said drilling unit being adjustable by means of said arm and its pivotal connection to said support to positions at various distances from said framework.

5. In mining apparatus, the combination with supporting framework, of a rack bar mounted on said framework for adjustment transversely thereof, means connected to said rack bar to move the same transversely of the framework, an arm pivoted at its rear end to said rack bar, a turntable pivoted to the forward end of said arm, a drilling unit, and means for mounting said drilling unit on said turntable.

6. In mining apparatus, the combination with supporting framework, of a carriage mounted on said framework for adjustment transversely thereof, an arm pivoted to said carriage, a turntable pivoted to the outer end of said arm, a drilling unit, and means for adjustably supporting said drilling unit on said turntable.

'7. In mining apparatus, the combination with supporting framework, of an elongated supplemental support slidably mounted on said framework for adjustment transversely thereof, an arm, means for pivotally connecting one end of said arm to either end of said elongated supplemental support, and means on the outer end of said arm for supporting a drilling machine for adjustment relative to said arm on rectangularly related axes. I

8. The combination with a mining machine comprising a kerf cutter and means for adjusting the same for bottom cutting or top cutting, of laterally adjustable supports on the upper front side of the framework of the mining machine and on the lower front side thereof, a drilling machine, and mechanism for mounting the drilling machine on said adjustable supports for operation from either of the upper corners of the front end of the framework when the kerf cutter is in bottom cutting position and for operation from either of the lower corners of the framework when the kerf cutter is in top cutting position.

9. In mining apparatus, the combination with supporting framework, of a drilling unit, brackets 7 on opposite sides of said drilling unit, and mechanism adapted to be connected to either bracket independently of the other for supporting the drilling unit on said framework for operation adjacent either rib of the mine entry and parallel thereto.

10. In mining apparatus, the combination with supporting framework, of an elongated rack-bar mounted on said framework for adjustment transversely thereof, means connected to said rack bar to move the same transversely of the framework, an arm pivoted at its rear end to said rack bar, a support pivoted to the outer end of said arm, a drilling unit, means for mounting said drilling unit on said support to move bodily therewith, and means for locking said support in adjusted position relative to said arm.

11. In mining apparatus, the combination with a carrier, of a support pivoted thereto for rotary adjustment relative thereto, a drilling unit, two brackets carried by said drilling unit one on one side thereof and the other on the other side thereof, and means on said support adapted to be connected to either of said brackets to carry the drilling unit on said support.

12. In mining apparatus, the combination with a supporting frame, of an elongated bar slidably adjustable relative thereto, an arm, means for pivotally connecting the rear end of said arm to either end of said slidable bar, a support pivoted to the outer end of said arm, a drilling unit, and means adapted to connect either of opposite sides of said drilling unit to said support to enable location of said drilling unit closely adjacent to either of the opposite ribs of a mine entry.

13. Apparatus for supporting a drilling unit in operating position, comprising a semi-circularly flanged device on one side of the drilling unit, and mechanism comprising a semi-circularly grooved socket for receiving said flanged device and thereby afford support of the drilling unit in operating position.

14. Apparatus for detachably supporting a drilling unit in operating position, comprising the combination with a support having an arcuate groove, of an arcuately flanged device fitting said groove concentrically therewith, and a locking plate detachably securing said arcuately grooved support and said arcuately flanged device against withdrawal from each other, but permitting arcuate adjustment of the drilling unit relative to said support.

15. The combination with a mining machine comprising a kerf-cutter and means for adjusting the same for bottom cutting or top cutting, a drilling machine, means for supporting the drilling machine on the upper portion of the mining machine when the kerf-cutter is in bottom cutting position, means for supporting the same drilling machine from the lower portion of said frame when the kerf-cutter is in top cutting position, and means for operating the drilling machine during feeding movement of the kerfcutter.

16. The combination with a mining machine comprising a kerf-cutter and means for adjusting the same for bottom cutting or top cutting, a drilling machine, means for supporting the drilling machine from either of the upper corners of the front end of the framework of the mining machine when the kerf-cutter is in bottom cutting position, means for supporting the drilling machine from either of the lower corners of the front end of the framework of the mining machine when the kerf-cutter is in top cutting position, and means for operating the drilling machine during feeding movement of the kerfcutter.

' 17. In mining apparatus, the combination with a supporting frame, of a track extending across the front end of said frame, a carriage having flanged wheels engaging said track to prevent withdrawal of the carriage from said frame but permitting movement of the carriage across the front end of said frame, a drilling machine, and a supporting arm pivotally connected at one end to said carriage and at its other end to said drilling machine.

18. In mining apparatus, the combination with a supporting frame, of a track thereon, a carriage movable along said track, a drilling machine, mechanism for supporting said drilling machine on said carriage to move bodily therewith, and mechanism comprising a spring-pressed pin for holding the carriage in adjusted position relative to said track.

19. In mining apparatus, the combination with a supporting frame, of a track thereon and comprising spaced-apart rails, a carriage having flanged wheels engaging said rails, drilling machine supporting mechanism mounted on said carriage, and locking mechanism comprising a spring-pressed pin on said carriage in position to enter any one of a series of spaced-apart recesses in a plate supported by said frame.

20. In mining apparatus, the combination with a supporting frame, of a supplemental support carried thereby for adjustment relative thereto, an arm pivoted to said supplemental support on an upright axis, a tertiary support pivoted to the outer end of said arm on an upright axis, and mechanism adapted to be connected to either side of a drilling machine for supporting the latter on said tertiary support.

21. In mining apparatus, the combination with a support, of mechanism for mounting a drilling machine on said support for adjustment relative thereto on rectangularly related axes, said mounting mechanism comprising a tongue on each side of said drilling machine either tongue being adapted to co-operate with a groove connection for tilting adjustment of the drilling machine on an axis extending transversely of itself, and said mounting mechanism comprising a rotary device between said support and said tongue and groove connection for swinging adjustment of the drilling machine on the other axis.

22. In mining apparatus, the combination with a supporting frame, of a turntable mounted thereon for rotary adjustment relative thereto on an upright axis, a supplemental support mounted on said turntable for adjustment transversely thereof to project outwardly from said frame toward one of the ribs of the mine entry, a sup porting arm pivoted at its rear end to the outer projecting end of said supplemental support to extend the reach toward said rib, a drilling unit pivotally mounted on the outer free end of said arm, and means for rotating said turntable in a direction to move the pivotal connection between the arm and the supplemental support toward said rib and thereby adjust the drilling unit to a position still farther away from said frame and closer to the said rib.

23. In mining apparatus, the combination with a supporting frame, of a turntable mounted thereon for movement relative thereto on an upright axis, a supporting arm pivotally connected to said turntable for swinging adjustment relative thereto on an upright axis, a drilling unit, and mechanism for mounting said drilling unit on the outer free end of said arm for adjustment relative thereto on rectangularly related axes one of which is vertical and parallel to and spaced from said first-named upright axis.

24. In mining apparatus, the combination with a support, of a drilling unit, semi-circular brackets on apposite sides of the drilling unit, and means adapted to be connected to either bracket independently of the other for supporting the drilling unit on said support for operation from either side thereof.

25. In mining apparatus, the combination with a drilling unit, of a semi-circular bracket secured thereto, and means comprising a semi-circular socket adapted to receive and support the drilling unit in operating position and for adjustment arcuately on the center of said semi-circular socket.

26. In mining apparatus, the combination with a drilling machine unit, of a support, means affording an annular grooved track on said support, arcuate tongues secured to opposite sides of said drilling machine unit and each adapted to extend into said grooved track to move arcuately along the same, and a disk secured to said support concentrically with either of said grooved tracks in position to lock either of said arcuate tongues in said groove thereby mounting said drilling unit on said support from either side thereof for adjustment on an axis extending at right angles to the feeding axis of the drilling machine unit.

27. In a mining machine, the combination with a portable base, of a turntable mounted thereon for rotation relatively thereto on an upright axis, a head mounted on said turntable for adjustment relative thereto on a horizontal radial axis, an elongated chain kerf-cutter pivotally connected to said head on an axis extending at right angles to said horizontal axis, said last-named axis being confined to adjustments in a plane parallel to said vertical axis of the turntable, a drilling machine unit, means for supporting the drilling machine unit on the upper portion of said portable base for operation adjacent to and approximately parallel with either rib, means for supporting the drilling unit on the lower portion of said support for operation closely adjacent either rib, and motor operated mechanism for adjusting said head on said horizontal axis and for adjusting 'said elongated chain kerf-cutter on said transverse axis in co-operation with the various positions of the drilling unit closely adjacent to either rib and approximately parallel thereto while drilling in the working face extending across the space in advance of the mining machine.

28. In a mining machine, the combination with a portable base having a relatively low overall height, of a turntable directly above said base, a support extending outwardly from said turntable in a horizontal radial direction, a head mounted on said support for rotary adjustment relative thereto on a horizontal axis spaced below a horizontal plane extending through the top of said support, a chain kerf-cutting mechanism mounted on said head for pivotal movement therewith on said horizontal axis, a drilling unit, and means for mounting said drilling unit in advance of said base for operation adjacent the said horizontal plane while the said horizontal axis is spaced below such horizontal plane and said chain kerf-cutter is spaced below said horizontal axis.

29. In a drilling machine, the combination with a portable base, of a turntable mounted thereon for adjustment relative thereto on an upright axis, a relatively short bearing mounted on said turntable and extending radially therefrom, a turnover head mounted on said short bearing near said turntable, a chain kerf-cutter comprising an elongated cutter bar pivoted to said head on an axis extending transversely of the turnover head axis, a drilling unit, and means mounting said drilling unit on said portable base for operation in planes above and below said turnover head and said chain kerf-cutter.

30. In a mining machine, the combination with a portable base, of a turntable mounted thereon for adjustment relative thereto on an upright axis, a radial bearing on said turntable, a rotatable head mounted on said bearing and provided with an extension transversely of the axis of said bearing, a chain kerf-cutter comprising an elongated cutter bar pivoted to said head on a transverse axis at right angles to the axis of said bearing to occupy a position parallel to said bearing and spaced therefrom, mechanism for rotating said head on said bearing axis while said transverse axis is confined to a plane parallel to the turntable axis, a drilling unit adjustably mounted on said turntable to move bodily therewith, and mechanism for adjusting the elevation of said turntable relative to said base and thereby adjust the elevation of said chain kerf-cutter relative to the mine bottom.

31. In mining apparatus, the combination with a portable support, of a turntable thereon, a kerf-cutter mounted on said turntable for adjustment relative thereto on a horizontal axis spaced below the top of the machine, means for operating said kerf-cutter in its adjusted position, a drilling machine unit, and means for supporting said drilling machine unit on said turntable for adjustment above the feeding path of the kerf-cutter and for operation approximately in a horizontal plane extending through the top of the machine, the said lowered axis afiording ample clearance for movement of said supporting means over the top of the kerf-cutting mechamsm.

32. In a mining machine, the combination with supporting framework, of a drilling machine unit, a kerf-cutter comprising a cutter bar, a cutter head for supporting said cutter bar, drilling machine supporting mechanism extending from the top of said framework in advance thereof in a general horizontal direction, means mounting said supporting mechanism on the machine for movement rectilinearly across the top of the space occupied by said kerf-cutter and said cutter head, and means for supporting said head on said framework for adjustment relative thereto on a horizontal axis spaced below the top of the framework and spaced from the cutter bar to enable said drilling machine supporting mechanism to clear the top of said cutter head when such drilling machine supporting mechanism is moved from one side of the machine to the other.

33. In a mining machine, the combination with supporting framework, of a drilling machine unit, of a kerf-cutter comprising a cutter bar, a cutter head for supporting said cutter bar, drilling machine supporting mechanism extending from the bottom of said framework in advance thereon in a general horizontal direction and movable across the bottom of the space occupied by said kerf-cutter and said cutter head, and means for supporting said head on said framework for adjustment relative thereto on a horizontal axis spaced below a horizontal plane extending through the top of the machine, such axis being also spaced from the cutter bar, to enable the drilling machine supporting mechanism to clear the bottom of said cutter head when said drilling machine supporting mechanism is moved from one side of the machine to the other.

34. In a mining machine, the combination with supporting framework, of a drilling machine unit, a kerf-cutter comprising a cutter bar, a turnover cutter head for pivotally supporting said cutter bar, drilling machine supporting mechanism movable from one side of the machine to the other at the top or bottom thereof, mechanism for supporting said head for adjustment relative to said framework on a horizontal axis spaced below a horizontal plane extending through the top of the machine to enable said drilling machine supporting mechanism to be moved from one side to the other of the machine below said cutter head when said kerfcutter is in top cutting position and to enable said drilling machine supporting mechanism to be moved from one side of the machine to the other above said cutter head when the kerf-cutter is in bottom cutting position.

35. In a mining machine, the combination with supporting framework, of a kerf-cutting tool, mechanism for supporting said kerf-cutting tool for operation in a relatively high plane or in a relatively low plane, a drilling machine unit, mechanism for supporting said drilling machine unit on said framework to effect the drilling of holes perpendicular to a coal face extending across the space in advance of the mining machine with such perpendicular holes in a vertical plane extending through the longitudinal center line of the machine and with such holes located above and below such relatively high and low kerfs, and means for operating said kerf-cutter and said drilling machine unit simultaneously.

36. In a mining machine, the combination with a supporting frame, of a kerf-cutter mounted thereon for swinging feeding movement on an upright axis, a drilling machine, means for removably supporting said drilling machine on the front end of said frame directly under the kerf-cutter when the latter extends longitudinally of the machine for drilling a perpendicular hole in a transverse working face in advance of the machine under the kerf cut by said kerfcutter, and means for operating said kerf-cutter including swinging feeding movement thereof on said upright axis during operation of said drilling machine.

37. In mining apparatus, the combination with a supporting frame, of a supplemental support mounted on said frame for rectilinear adjustment transversely thereof, a supporting arm pivoted to said supplemental support to swing outwardly from said supporting frame on a vertical axis, and mechanism for mounting a drilling machine on the outer end of said arm for adjustment relative thereto on rectangularly related axes and to occupy positions in advance of said frame, the structure being such as to permanently confine one of the rectangularly related axes to being vertical and the other horizontal.

LEWIS E. MITCHELL. 

